CN110907505A - Non-contact online real-time moisture detector - Google Patents
Non-contact online real-time moisture detector Download PDFInfo
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- CN110907505A CN110907505A CN201911212969.4A CN201911212969A CN110907505A CN 110907505 A CN110907505 A CN 110907505A CN 201911212969 A CN201911212969 A CN 201911212969A CN 110907505 A CN110907505 A CN 110907505A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000007791 liquid phase Substances 0.000 claims abstract description 17
- 239000007790 solid phase Substances 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 28
- 238000009529 body temperature measurement Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
Abstract
The invention discloses a non-contact online real-time moisture detector which comprises a converter and a sensor, wherein the converter comprises an acquisition module, an MCU module and at least two signal output modules, and the sensor comprises a measuring pipeline and a pair of measuring electrodes attached along the periphery of the measuring pipeline; the acquisition module is used for acquiring an empty tube capacitance value, a full tube capacitance value and an actual capacitance value between the pair of measurement electrodes at the same temperature; the MCU module is used for calculating to obtain a structural coefficient of the sensor according to the empty pipe capacitance value, the full pipe capacitance value and the liquid-phase dielectric constant of water, calculating to obtain the actual dielectric constant of the liquid to be detected according to the actual capacitance value, the empty pipe capacitance value and the structural coefficient, and calculating the ratio of the difference between the actual dielectric constant and the preset solid-phase dielectric constant to the difference between the liquid-phase dielectric constant and the solid-phase dielectric constant to serve as the water content of the liquid to be detected. The invention can realize the non-contact measurement of the liquid, improve the real-time performance of the measurement and provide various output modes.
Description
Technical Field
The invention relates to the technical field of flow detection, in particular to a non-contact online real-time moisture detector.
Background
Most of the water detectors in the market at present are in an off-line detection mode, and need to sample the fluid to be detected so as to realize the analysis and measurement of the water content, and the detection method is poor in real-time performance and cannot acquire the water content of the fluid to be detected in time. A small part of online moisture content detectors are mostly nuclear devices with radioactivity, the moisture content is measured through radioactive rays, the mode is high in cost, and radiation hazard is caused to users. Moreover, the moisture detectors usually have single output mode and narrow applicable working condition, and the operation of the moisture detectors usually needs to be performed on the equipment, so that the operation and observation are inconvenient under the condition of narrow installation environment.
Disclosure of Invention
The invention mainly solves the technical problem of providing a non-contact on-line real-time moisture detector, which can realize non-contact measurement of liquid, improve the measurement real-time property and provide various output modes.
In order to solve the technical problems, the invention adopts a technical scheme that: the non-contact online real-time moisture detector comprises a converter and a sensor, wherein the converter comprises an acquisition module, an MCU module and at least two signal output modules, the sensor comprises a measuring pipeline and a pair of measuring electrodes, and the pair of measuring electrodes are attached to and arranged oppositely along the periphery of the measuring pipeline; the acquisition module is used for acquiring an empty tube capacitance value between the pair of measuring electrodes when the measuring pipeline is empty and a full tube capacitance value between the pair of measuring electrodes when the measuring pipeline is filled with water at the same temperature, acquiring an actual capacitance value between the pair of measuring electrodes when liquid to be measured flows through the measuring pipeline, and transmitting the empty tube capacitance value, the full tube capacitance value and the actual capacitance value to the MCU module; the MCU module is used for calculating to obtain a structural coefficient of the sensor according to the empty pipe capacitance value, the full pipe capacitance value and the liquid phase dielectric constant of water, calculating to obtain an actual dielectric constant of the liquid to be detected according to the actual capacitance value, the empty pipe capacitance value and the structural coefficient, calculating a ratio of a difference between the actual dielectric constant and a preset solid phase dielectric constant to a difference between the liquid phase dielectric constant and the solid phase dielectric constant to serve as the water content of the liquid to be detected, and sending the water content to the at least one signal output module; and the at least two signal output modules are used for outputting the signals of the water content in different signal output modes.
As a preferred embodiment of the present invention, the sensor further includes a temperature meter, the temperature meter is disposed in the measurement pipeline, and the acquisition module is further configured to acquire a temperature measurement value of the temperature meter when the liquid to be measured flows through the measurement pipeline, and transmit the temperature measurement value to the MCU module; and the MCU module is also used for correcting the liquid-phase dielectric constant according to the temperature measurement value before calculating the structural coefficient.
As a preferred embodiment of the present invention, the temperature measuring meter is a thermistor, and the temperature measurement value is a thermistor value.
As a preferred embodiment of the present invention, there are three signal output modules, and the signal output modes are current output, passive pulse output, and 485 output, respectively.
As a preferred embodiment of the present invention, the converter further includes a near field communication module, and the MCU module is further configured to send the moisture content to the near field communication module; the near field communication module is used for establishing near field communication connection with third-party equipment and outputting signals of the water content through the near field communication connection.
As a preferred embodiment of the present invention, the near field communication module is a bluetooth module, and the near field communication connection is a bluetooth connection.
As a preferred embodiment of the present invention, the near field communication module is further configured to receive a control instruction through the near field communication connection, and send the control instruction to the MCU module; and the MCU module is also used for modifying the empty tube capacitance value and/or the full tube capacitance value according to the control instruction.
As a preferred embodiment of the present invention, the converter further includes a power supply module, and the power supply module is configured to perform voltage conversion on the commercial power to supply power to the MCU module, the acquisition module, and the at least two signal output modules.
As a preferred embodiment of the present invention, when the at least two signal output modules perform signal output on the moisture content, the moisture content is encrypted according to a predetermined encryption algorithm.
Different from the prior art, the invention has the beneficial effects that:
1. realizing on-line real-time measurement;
2. the fluid does not need to be in direct contact with the sensor, and non-contact measurement is realized;
3. when the capacitance value is measured, the temperature of the fluid can be measured, and the moisture content is compensated by using the temperature;
4. the signal output mode is at least one, is suitable for various communication devices, and has wide application range;
5. the moisture content is transmitted through the Bluetooth connection, and meanwhile, the converter can be remotely controlled, so that the remote control of the detector can be realized, and the detector does not need to be directly observed in a contact manner;
6. the water content is encrypted by adopting an encryption algorithm and then transmitted, so that the data security can be ensured, the measured data is ensured to be safe and reliable, and malicious tampering is prevented.
Drawings
Fig. 1 is a schematic structural diagram of a non-contact online real-time moisture detector according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a sensor of a non-contact online real-time moisture detector in accordance with an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, the non-contact online real-time moisture detector according to the embodiment of the invention includes a converter 10 and a sensor 20, the converter 10 includes an acquisition module 12, an MCU module 11 and at least two signal output modules 13, the sensor 20 includes a measurement pipe 21 and a pair of measurement electrodes 22, and the pair of measurement electrodes 22 are attached along the outer circumference of the measurement pipe 21 and are disposed oppositely.
The collecting module 12 is configured to collect, at the same temperature, an empty-tube capacitance value between the pair of measuring electrodes 22 when the measuring pipe 21 is empty, a full-tube capacitance value between the pair of measuring electrodes 22 when the measuring pipe 21 is filled with water, collect an actual capacitance value between the pair of measuring electrodes 22 when the liquid to be measured flows through the measuring pipe 21, and transmit the empty-tube capacitance value, the full-tube capacitance value, and the actual capacitance value to the MCU module 11.
The MCU module 11 is configured to calculate a structural coefficient of the sensor 20 according to the empty tube capacitance value, the full tube capacitance value, and the liquid-phase dielectric constant of water, calculate an actual dielectric constant of the liquid to be measured according to the actual capacitance value, the empty tube capacitance value, and the structural coefficient, calculate a ratio of a difference between the actual dielectric constant and a preset solid-phase dielectric constant to a difference between the liquid-phase dielectric constant and the solid-phase dielectric constant, and send the water content to the at least one signal output module 13. The predetermined solid-phase dielectric constant is the solid-phase dielectric constant of the solid in the mixed liquid (e.g., cement), and is previously introduced into the MCU module 11 by the inspector. In an ideal state, the relationship between the actual dielectric constant and the actual capacitance value is as follows:
C＝ATC*ε (1)
where C is the actual capacitance value, ATCFor the structural coefficient, ε is the actual dielectric constant.
However, in actual measurement, parasitic capacitance is difficult to avoid, and the parasitic capacitance can be eliminated by calculation of the capacitance difference.
C＝ATC*ε+CS；C0＝ATC*ε0+CS(2)
The following can be obtained in a simultaneous manner:
ε＝(C-C0)/ ATC+ε0(3)
in the formula, epsilon0To measure the dielectric constant of the air when the duct 21 is empty, known as C0Is the empty tube capacitance value. Thus, it is desirable to obtain a in the formulaTCThe value of (a) can yield the actual dielectric constant.
Since the empty tube capacitance, the full tube capacitance and the liquid-phase dielectric constant of water are known, the following formula (2) shows:
CL＝ATC*εL+CS；C0＝ATC*ε0+CS(4)
the following can be obtained in a simultaneous manner:
ATC＝(CL-C0)/(εL-ε0) (5)
in the formula, epsilonLFor measuring the liquid-phase dielectric constant, C, of water when the pipe 21 is filled with waterLIs the full tube capacitance.
The actual dielectric constant ε is determined by the expressions (3) and (5).
Thus, the water content is (ε - ε)S)/(εL-εS) Wherein, epsilonSIs a preset solid phase dielectric constant.
The at least two signal output modules 13 are used for outputting signals to the water content by adopting different signal output modes. The number of the signal output modules 13 is three, and the signal output modes are current output, passive pulse output and 485 output respectively. In consideration of data and communication safety, when the at least two signal output modules 13 output signals to the moisture content, the moisture content is encrypted according to a preset encryption algorithm.
In view of the influence of temperature on the measurement result, the measurement result needs to be compensated when the temperature changes, in this embodiment, the sensor 20 further includes a temperature meter 23, the temperature meter 23 is disposed in the measurement pipeline 21, and the acquisition module 12 is further configured to acquire the temperature measurement value of the temperature meter 23 when the liquid to be measured flows through the measurement pipeline 21, and transmit the temperature measurement value to the MCU module 11. The temperature meter 23 is, for example, a thermistor, and the temperature measurement value is a thermistor value.
The MCU module 11 is also used to correct the liquid phase dielectric constant according to the temperature measurements 11 before calculating the structural coefficients. The MCU module 11 may store a linear relationship table of liquid-phase dielectric constant and temperature, determine the liquid-phase dielectric constant corresponding to the temperature measurement value by table lookup, and then change the liquid-phase dielectric constant of water to the liquid-phase dielectric constant obtained by table lookup.
In this embodiment, the converter further includes a near field communication module 14, the MCU module 11 is further configured to send the moisture content to the near field communication module 14, and the near field communication module 14 is configured to establish a near field communication connection with a third party device, and output a signal of the moisture content through the near field communication connection. Near field communication module 14 is bluetooth module for example, and near field communication connects for the bluetooth is connected, and the moisture content can be looked over through bluetooth to third party's equipment, and in the comparatively abominable occasion of installation environment, greatly improved the convenience of use. Further, the near field communication module 14 is further configured to receive a control instruction through the near field communication connection, and send the control instruction to the MCU module 11, and the MCU module 11 is further configured to modify the empty tube capacitance value and/or the full tube capacitance value according to the control instruction. In addition, the structural coefficient, the near field communication configuration parameters and other information can be modified through the control instruction.
Considering that the converter 10 needs to supply power, in this embodiment, the converter 10 further includes a power module 15, and the power module 15 is configured to perform voltage conversion on the commercial power to supply power to the MCU module 11, the acquisition module 12, and the at least two signal output modules 13.
Through the mode, the non-contact online real-time moisture detector converts the capacitance value into the dielectric constant by measuring the capacitance value of the liquid in real time, calculates the water content by utilizing the structural coefficient of the sensor, and outputs the water content in various signal output modes.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A non-contact online real-time moisture detector is characterized by comprising a converter and a sensor, wherein the converter comprises an acquisition module, an MCU module and at least two signal output modules, the sensor comprises a measuring pipeline and a pair of measuring electrodes, and the pair of measuring electrodes are attached along the periphery of the measuring pipeline and are oppositely arranged;
the acquisition module is used for acquiring an empty tube capacitance value between the pair of measuring electrodes when the measuring pipeline is empty and a full tube capacitance value between the pair of measuring electrodes when the measuring pipeline is filled with water at the same temperature, acquiring an actual capacitance value between the pair of measuring electrodes when liquid to be measured flows through the measuring pipeline, and transmitting the empty tube capacitance value, the full tube capacitance value and the actual capacitance value to the MCU module;
the MCU module is used for calculating to obtain a structural coefficient of the sensor according to the empty pipe capacitance value, the full pipe capacitance value and the liquid phase dielectric constant of water, calculating to obtain an actual dielectric constant of the liquid to be detected according to the actual capacitance value, the empty pipe capacitance value and the structural coefficient, calculating a ratio of a difference between the actual dielectric constant and a preset solid phase dielectric constant to a difference between the liquid phase dielectric constant and the solid phase dielectric constant to serve as the water content of the liquid to be detected, and sending the water content to the at least one signal output module;
and the at least two signal output modules are used for outputting the signals of the water content in different signal output modes.
2. The non-contact online real-time moisture meter according to claim 1, wherein the sensor further comprises a temperature meter, the temperature meter is disposed in the measurement pipeline, and the acquisition module is further configured to acquire a temperature measurement value of the temperature meter when a liquid to be measured flows through the measurement pipeline and transmit the temperature measurement value to the MCU module;
and the MCU module is also used for correcting the liquid-phase dielectric constant according to the temperature measurement value before calculating the structural coefficient.
3. The non-contact online real-time moisture meter according to claim 2, wherein the temperature gauge is a thermistor and the temperature measurement is a thermistor value.
4. The non-contact online real-time moisture detector according to any one of claims 1 to 3, wherein the number of the signal output modules is three, and the signal output modes are current output, passive pulse output and 485 output.
5. The non-contact online real-time moisture detector according to claim 4, wherein the converter further comprises a near field communication module, and the MCU module is further configured to send the moisture content to the near field communication module;
the near field communication module is used for establishing near field communication connection with third-party equipment and outputting signals of the water content through the near field communication connection.
6. The instrument of claim 5, wherein the NFC module is a Bluetooth module and the NFC connection is a Bluetooth connection.
7. The multifunctional high-precision electromagnetic flowmeter converter of claim 5, wherein the near-field communication module is further configured to receive control instructions over the near-field communication connection and send the control instructions to the MCU module;
and the MCU module is also used for modifying the empty tube capacitance value and/or the full tube capacitance value according to the control instruction.
8. The non-contact online real-time moisture detector according to claim 1, wherein the converter further comprises a power module, and the power module is used for performing voltage conversion on mains supply to supply power to the MCU module, the acquisition module and the at least two signal output modules.
9. The non-contact online real-time moisture detector according to claim 1, wherein the moisture content is encrypted according to a predetermined encryption algorithm when the at least two signal output modules output the moisture content.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251723Y (en) * | 1995-06-22 | 1997-04-09 | 大庆石油管理局油田建设设计研究院 | Intelligence helical capacitance type detector for testing water-in-oil |
| US20100107775A1 (en) * | 2008-11-06 | 2010-05-06 | Northeastern University | System, Method, And Device For Measuring Parameters Of A Two-Phase Flow |
| CN101839881A (en) * | 2010-04-14 | 2010-09-22 | 南京工业大学 | On-line calibration capacitance tomography system by gas-solid two-phase flow and on-line calibration method |
| WO2010109317A1 (en) * | 2009-03-26 | 2010-09-30 | Pricol Limited | Capacitive measurement of fuel level and dielectric constant |
| CN104280430A (en) * | 2014-10-14 | 2015-01-14 | 西安理工大学 | Device and method for measuring water content in crude oil |
| CN105158578A (en) * | 2015-08-25 | 2015-12-16 | 北京工业大学 | Bridge method-based device for measuring dielectric constant of organism |
| CN107490604A (en) * | 2017-07-29 | 2017-12-19 | 安徽金大仪器有限公司 | Analyzer of water content and utilization impedance type principle measurement measurement of water ratio method |
| CN109884134A (en) * | 2019-04-03 | 2019-06-14 | 哈尔滨理工大学 | A kind of electric pole type crude oil water content real-time detector |
-
2019
- 2019-12-02 CN CN201911212969.4A patent/CN110907505B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251723Y (en) * | 1995-06-22 | 1997-04-09 | 大庆石油管理局油田建设设计研究院 | Intelligence helical capacitance type detector for testing water-in-oil |
| US20100107775A1 (en) * | 2008-11-06 | 2010-05-06 | Northeastern University | System, Method, And Device For Measuring Parameters Of A Two-Phase Flow |
| WO2010109317A1 (en) * | 2009-03-26 | 2010-09-30 | Pricol Limited | Capacitive measurement of fuel level and dielectric constant |
| CN101839881A (en) * | 2010-04-14 | 2010-09-22 | 南京工业大学 | On-line calibration capacitance tomography system by gas-solid two-phase flow and on-line calibration method |
| CN104280430A (en) * | 2014-10-14 | 2015-01-14 | 西安理工大学 | Device and method for measuring water content in crude oil |
| CN105158578A (en) * | 2015-08-25 | 2015-12-16 | 北京工业大学 | Bridge method-based device for measuring dielectric constant of organism |
| CN107490604A (en) * | 2017-07-29 | 2017-12-19 | 安徽金大仪器有限公司 | Analyzer of water content and utilization impedance type principle measurement measurement of water ratio method |
| CN109884134A (en) * | 2019-04-03 | 2019-06-14 | 哈尔滨理工大学 | A kind of electric pole type crude oil water content real-time detector |
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Address after: 2107, Tower B, Maoye center, No.28, north section of Tianfu Avenue, high tech Zone, Chengdu, Sichuan 610041 Patentee after: Sichuan Zhongda Huarui Energy Group Co.,Ltd. Address before: 2107, Tower B, Maoye center, No.28, north section of Tianfu Avenue, high tech Zone, Chengdu, Sichuan 610041 Patentee before: Sichuan Huarui High Energy Technology Co.,Ltd. |
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